Screw-propeller.



W. H. CLARK.

SCREW PROPELLBR. I APPLIUATION FILED 111111120, 1910.

1,007,183. Patented 0111311911.

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3110c 1 1 foz Wdmeaoeo 1 W. H. CLARK.

SCREW PROPELLER.

APPLICATION FILED MAY 20. 1910. I

Patented 0013. 31, 1911.

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5] M 00-14 fox 7 WMAM r6 UNITED STATES PATENT OFFICE.

WILLIAM H. CLARK, 0F CLEVELAND, OHIO. I

SCBEW-PROPELLEB Specification of Letters Latent.

Patented Oct. 31, 1911.

Application filed they 20, 1910. Serial No. 562,501.

To all whom it may concern:

Be it known that I, WILLIAM H. CLARK, citizen of the United States,residing at Cleveland, in the county. of Cuyahoga and State of Ohio,have invented certain new and useful *Improvements "in Screw-Propellers,of which the following is a specificadirect propulsion in the line offlight, or it may be used for lifting purposes, when applied to flyingmachines.

An embodiment of the invention is illustrated in the accompanyingdrawings in which Figure 1 is a top or end view of the propeller. Fig. 2is a side elevation thereof, partly broken away. Figs. 3, 4', 5 and 6are details in plan and section of various parts to be hereinafterparticularly described. Fig. 7 is an elevation of' a modification.

Referring specifically to the drawings, A indicates a driving shaftwhich turns in a bearing in a casting B and is geared by bevel wheels Gto the propeller shaft D one end of which is stepped in a bearing in theangle casting B' which is mounted on a mem ber H of the frame. The otherend of the ,shaft D is keyed to a hub or casting E having fourangulararms as'shown,- each arm conslstlng of. a radial member extendingoutwardly from the center and connected 'by an'elbow to an outer memberat right angles thereto, these arms being arranged symmetrically aroundthe center, the iadial member being indicated at 6 and the outer, memberat 7, and all the armsbeing in the same plane. At the outer end of eachradial member 6 is a guide pin F, and projecting outwardly from the endof the outer member 7 is a pivot rod G, which is rigid' with the arm.The propeller blades S are mounted to turn on the rods G, by clips T,and said rods serve to support a part of the thrust on .the blades, andthe blades may be adjusted on said rods as axes to vary the inclinationor angle of the blades'with'respectto the plane of the wheel. A bracketJ is fastened to anotherpart of the frame H, and said bracket supports abent lever K which is pivoted at its elbow to the bracket and isconnected at its outer end to an operating rod R. The other arm of thelever has a pin and slot connection at 8 to a collar L which works in agroove in a sleeve M fast on one end of a tube N which incloses the;shaft D. Atits other end the tube is fastened to a casting O which hasfour radial arms projecting from the center thereof, and each arm has atthe outer end an upri ht part which extends. parallel to the sha t andis slotted as at P,'and these slots receive the guide ins F so that thecastings E and are/loo ed against relative rotation, but thecasting 0-may be moved lengthwise on the shaft. At the elbow of each arm 0 is arod U extending radially, and parallel to the rods G, and the rods Uhave rollers Q thereon, which fit, under guidestraps V attached to theblades.

By operation of the'rod R and bent lever K the tube N and casting 0attached thereto may be moved len wise on the propeller shaft, and whenthls is done the rods U are moved to a position toward or from the rodsG, and such movement, by means of the rollers Q and straps .V, turns theblades S on the pivot rods G, and so varies the angle pitch of' all theblades. As the head or casting O is moved toward the casting E theblades are. turned to decrease the angle thereof with respect to theplane of the wheel, and reversely, opposite motion increases it. Boththe rods G and the rods U assist in supporting the thrust orv strain onthe blades, and the construction provides a very light and convenientmechanism for effecting the result indicated.

Various modifications are possible within .the scope of the invention.Thus in the accompanying drawings four blades are illustrated, but thenumber'of blades may be varied as desired, and no limitation in thisrespect is implied. Furthermore, instead of having the pivot rods of theblades relatively fixed, and the shifting rods relatively movable, theconstruction may be reversed; that is, the tube N -and therods attachedthereto may be relatively the shaft shiftable tomove the pivot rodstoward or from the other rods, as shown in Fig. 7.

Having thus described the invention, what I claim as new, and desire tosecure, by Letters Patent is 1. The combination of a propeller shaft, ahub thereon having outwardly projecting angular arms with ides thereon,blades pivotallyattached to the outer ends of said arms, a tubularmember surrounding and slidable along the shaft and engaging the guidesto prevent rotation of the member relative to the hub, and connectionsbetween said member and the blades to turn the latter on their pivotswhen the member 'is shifted along the shaft.

2. The combination of a propeller shaft, a hub fast thereto, pivot rodsprojecting outwardly from the hub, blades mounted to turn on said rods,a head slidable along the shaft,guides between the hub and head toglint)? 1&3

rojecting from the head, parallel to the pivot rods and connected to theblades, to turn the same on the pivot rods, and means to shift the headalong the shaft.

3. The combination of a propeller shaft, a hub fixed thereon and havingprojecting guide pins, blades ivotally connected to said hub, a headslidable along the shaft 1 and having arms extending parallel to theshaft, said arms having slots in which the pins are engaged, to preventrelative rotation of the hub and head, and connections between the headand the blades to turn the latter on their pivots when the head isshifted along the shaft.

In testimony whereof, I do afiix my signature in presence of twowitnesses.

WILLIAM H. CLARK. Witnesses:

HAnRrA. THoMrsoN, OAnLn'roN L. TERRY.

